San Francisco 49ers quarterback Alex Smith, left, runs with the ball past Detroit Lions strong safety Erik Coleman, center, and defensive end Cliff Avril, right, during the third quarter of an NFL football game in San Francisco, Sunday, Sept. 16, 2012. (AP Photo/Tony Avelar)

San Francisco 49ers quarterback Alex Smith during the fourth quarter of an NFL football game against the Detroit Lions in San Francisco, Sunday, Sept. 16, 2012. (AP Photo/Marcio Jose Sanchez)

San Francisco 49ers tight end Vernon Davis, left, is greeted in the end zone after scoring a touchdown during the fourth quarter of an NFL football game against the Detroit Lions in San Francisco, Sunday, Sept. 16, 2012. (AP Photo/Tony Avelar)

San Francisco 49ers tight end Vernon Davis, left, after scoring a touchdown during the fourth quarter of an NFL football game against the Detroit Lions in San Francisco, Sunday, Sept. 16, 2012. At right is Detroit Lions linebacker Ashlee Palmer. (AP Photo/Tony Avelar)

San Francisco 49ers tight end Vernon Davis, right, runs past Detroit Lions outside linebacker Justin Durant, left, to score a touchdown during the fourth quarter of an NFL football game in San Francisco, Sunday, Sept. 16, 2012. (AP Photo/Tony Avelar)

San Francisco 49ers head coach Jim Harbaugh, left, and quarterback Alex Smith, right, during the fourth quarter of an NFL football game in San Francisco, Sunday, Sept. 16, 2012. (AP Photo/Tony Avelar)

Detroit Lions head coach Jim Schwartz, right, stands on the sidelines near head linesman Julian Mapp, left, during the fourth quarter of an NFL football gameagainst the San Francisco 49ers in San Francisco, Sunday, Sept. 16, 2012. (AP Photo/Tony Avelar)

Detroit Lions quarterback Matthew Stafford (9) is sacked by San Francisco 49ers outside linebacker Aldon Smith (99) during the fourth quarter of an NFL football game in San Francisco, Sunday, Sept. 16, 2012. San Francisco won 27-19. (AP Photo/Tony Avelar)

Detroit Lions tight end Brandon Pettigrew, right, makes a 9-yard touchdown reception next to San Francisco 49ers strong safety Donte Whitner (31) during an NFL football game in San Francisco, Sunday, Sept. 16, 2012. San Francisco won 27-19. (AP Photo/Tony Avelar)

San Francisco 49ers quarterback Alex Smith, left, hands off the ball to running back Frank Gore, right, during the fourth quarter of an NFL football game against the Detroit Lions in San Francisco, Sunday, Sept. 16, 2012. (AP Photo/Tony Avelar)

San Francisco 49ers tight end Vernon Davis runs into the end zone to score a touchdown as Detroit Lions outside linebacker Justin Durant (52), strong safety Erik Coleman (24) look on during the fourth quarter of an NFL football game in San Francisco, Sunday, Sept. 16, 2012. San Francisco won the game 27-19. Davis scored on a 23-yard pass from quarterback Alex Smith. (AP Photo/Marcio Jose Sanchez)

San Francisco 49ers quarterback Alex Smith during the fourth quarter of an NFL football game against the Detroit Lions in San Francisco, Sunday, Sept. 16, 2012. (AP Photo/Marcio Jose Sanchez)

Detroit Lions kicker Jason Hanson during the third quarter of an NFL football game against the San Francisco 49ers in San Francisco, Sunday, Sept. 16, 2012. (AP Photo/Tony Avelar)

San Francisco 49ers quarterback Alex Smith during the second quarter of an NFL football game against the Detroit Lions in San Francisco, Sunday, Sept. 16, 2012. (AP Photo/Tony Avelar)

San Francisco 49ers fans cheer at halftime during an NFL football game against the Detroit Lions in San Francisco, Sunday, Sept. 16, 2012. (AP Photo/Marcio Jose Sanchez)

San Francisco 49ers quarterback Alex Smith drops back to throw during the second quarter of an NFL football game in San Francisco, Sunday, Sept. 16, 2012. (AP Photo/Tony Avelar)

San Francisco 49ers tight end Vernon Davis celebrates in the end zone after scoring a touchdown on a 23-yard pass from quarterback Alex Smith during the fourth quarter of an NFL football game against the Detroit Lions in San Francisco, Sunday, Sept. 16, 2012. (AP Photo/Marcio Jose Sanchez)

Detroit Lions quarterback Matthew Stafford, right, is brought down by San Francisco 49ers outside linebacker Ahmad Brooks, left, during the fourth quarter of an NFL football game in San Francisco, Sunday, Sept. 16, 2012. (AP Photo/Tony Avelar)

San Francisco 49ers tight end Vernon Davis, right, runs to score a touchdown as Detroit Lions cornerback Jacob Lacey, left, watches during the fourth quarter of an NFL football game in San Francisco, Sunday, Sept. 16, 2012. Davis scored on a 23-yard pass from quarterback Alex Smith. (AP Photo/Tony Avelar)

Detroit Lions quarterback Matthew Stafford, right, is brought down by San Francisco 49ers outside linebacker Ahmad Brooks, left, during the fourth quarter of an NFL football game in San Francisco, Sunday, Sept. 16, 2012. (AP Photo/Tony Avelar)

Detroit Lions defensive tackle Corey Williams, left, and defensive end Ronnell Lewis, right, rest on the bench during the third quarter of an NFL football game against the San Francisco 49ers in San Francisco, Sunday, Sept. 16, 2012. (AP Photo/Tony Avelar)

Detroit Lions wide receiver Calvin Johnson is brought down with the ball during the second quarter of an NFL football game against the San Francisco 49ers in San Francisco, Sunday, Sept. 16, 2012. (AP Photo/Tony Avelar)

Detroit Lions quarterback Matthew Stafford throws during the second quarter of an NFL football game against the San Francisco 49ers in San Francisco, Sunday, Sept. 16, 2012. (AP Photo/Tony Avelar)

Detroit Lions running back Kevin Smith, top, is upended by San Francisco 49ers free safety Dashon Goldson, bottom, during the third quarter of an NFL football game in San Francisco, Sunday, Sept. 16, 2012. (AP Photo/Tony Avelar)

San Francisco 49ers running back Kendall Hunter, right, runs with the ball, but is stopped by Detroit Lions free safety John Wendling, left, during the third quarter of an NFL football game in San Francisco, Sunday, Sept. 16, 2012. (AP Photo/Marcio Jose Sanchez)

San Francisco 49ers tight end Vernon Davis, left, and Detroit Lions defensive back Drayton Florence battle for the ball during the second quarter of an NFL football game in San Francisco, Sunday, Sept. 16, 2012. (AP Photo/Marcio Jose Sanchez)

Detroit Lions quarterback Matthew Stafford throws during the second quarter of an NFL football game against the San Francisco 49ers in San Francisco, Sunday, Sept. 16, 2012. (AP Photo/Tony Avelar)

Detroit Lions running back Kevin Smith, top, is upended by San Francisco 49ers free safety Dashon Goldson, bottom, during the third quarter of an NFL football game in San Francisco, Sunday, Sept. 16, 2012. (AP Photo/Tony Avelar)

San Francisco 49ers running back Kendall Hunter, right, runs with the ball, but is stopped by Detroit Lions free safety John Wendling, left, during the third quarter of an NFL football game in San Francisco, Sunday, Sept. 16, 2012. (AP Photo/Marcio Jose Sanchez)

San Francisco 49ers tight end Vernon Davis, left, and Detroit Lions defensive back Drayton Florence battle for the ball during the second quarter of an NFL football game in San Francisco, Sunday, Sept. 16, 2012. (AP Photo/Marcio Jose Sanchez)

Detroit Lions head coach Jim Schwartz applauds on the sidelines during the second quarter of an NFL football game against the San Francisco 49ers in San Francisco, Sunday, Sept. 16, 2012. At right is Detroit Lions outside linebacker Justin Durant. (AP Photo/Tony Avelar)

San Francisco 49ers quarterback Alex Smith throws during the second quarter of an NFL football game against the Detroit Lions in San Francisco, Sunday, Sept. 16, 2012. (AP Photo/Tony Avelar)

Detroit Lions wide receiver Calvin Johnson is stopped by San Francisco 49ers strong safety Donte Whitner, bottom, as defensive back Chris Culliver, top, moves in during the second quarter of an NFL football game in San Francisco, Sunday, Sept. 16, 2012. (AP Photo/Tony Avelar)

San Francisco 49ers defensive back Chris Culliver, left, breaks up a pass intended for Detroit Lions wide receiver Titus Young, right, during the first quarter of an NFL football game in San Francisco, Sunday, Sept. 16, 2012. An interference penalty was called on the play. (AP Photo/Tony Avelar)

San Francisco 49ers running back Frank Gore carries the ball during the second quarter of an NFL football game against the Detroit Lions in San Francisco, Sunday, Sept. 16, 2012. (AP Photo/Tony Avelar)

Detroit Lions quarterback Matthew Stafford, right, hands off the ball to running back Kevin Smith during the second quarter of an NFL football game against the San Francisco 49ers in San Francisco, Sunday, Sept. 16, 2012. (AP Photo/Tony Avelar)

The San Francisco 49ers defense during the second quarter of an NFL football game against the Detroit Lions in San Francisco, Sunday, Sept. 16, 2012. (AP Photo/Tony Avelar)

Detroit Lions wide receiver Nate Burleson is stopped by the San Francisco 49ers defense during the second quarter of an NFL football game in San Francisco, Sunday, Sept. 16, 2012. (AP Photo/Tony Avelar)

San Francisco 49ers running back Frank Gore, right, carries the ball past Detroit Lions defensive back Drayton Florence, left, during the second quarter of an NFL football game in San Francisco, Sunday, Sept. 16, 2012. (AP Photo/Tony Avelar)

San Francisco 49ers head coach Jim Harbaugh yells during the second quarter of an NFL football game against the Detroit Lions in San Francisco, Sunday, Sept. 16, 2012. (AP Photo/Tony Avelar)

San Francisco 49ers tight end Vernon Davis runs with the ball for a touchdown past Detroit Lions free safety John Wendling, right, during the first quarter of an NFL football game in San Francisco, Sunday, Sept. 16, 2012. Davis scored on a 21-yard pass from quarterback Alex Smith. (AP Photo/Tony Avelar)

San Francisco 49ers wide receiver Randy Moss reaches for a pass, but Detroit Lions cornerback Jacob Lacey is called for interference on the play, during the first quarter of an NFL football game in San Francisco, Sunday, Sept. 16, 2012. (AP Photo/Marcio Jose Sanchez)

San Francisco 49ers head coach Jim Harbaugh and his team prepare to come onto the field at the start of their NFL football game against the Detroit Lions in San Francisco, Sunday, Sept. 16, 2012. (AP Photo/Marcio Jose Sanchez)

San Francisco 49ers running back Frank Gore celebrates after scoring a touchdown during the second quarter of an NFL football game against the Detroit Lions in San Francisco, Sunday, Sept. 16, 2012. (AP Photo/Marcio Jose Sanchez)

San Francisco 49ers running back Frank Gore carries the ball into the end zone for a touchdown during the second quarter of an NFL football game against the Detroit Lions in San Francisco, Sunday, Sept. 16, 2012. At right is 49ers defensive tackle Will Tukuafu (92). (AP Photo/Marcio Jose Sanchez)

San Francisco 49ers defensive back Chris Culliver, right, breaks up a pass intend for Detroit Lions wide receiver Titus Young, left, during the first quarter of an NFL football game in San Francisco, Sunday, Sept. 16, 2012. A pass interference penalty was called on the play. (AP Photo/Marcio Jose Sanchez)